John says that when you add 7 2/3 to 2 2/3 you must add the whole numbers together first ( 7+2=9) then you just add the numerator together (2+2=4)and you add the denominators unfortunately John stratagy is in correct and then briefly explain the flaw in John reasoning
John's strategy is incorrect because when adding mixed numbers, you must first add the whole numbers together and then add the fractions separately. So, for this problem, 7 2/3 + 2 2/3, you should add the whole numbers (7+2=9) and then add the fractions (2/3 + 2/3 = 4/3). The correct sum should be 9 4/3, not 9 4/6 as John's strategy would suggest.
